The Dynamic Language Learning Progression (DLLP) project at the UCLA Department of Education and CRESST are conducting an ongoing research study in conjunction with the UCLA Lab School to identify and describe the developmental progression of children’s explanations across the grade span. The project aims to aid in the development of the new assessment framework for English language development founded on the WIDA standards and to hypothesize the intermediate building blocks on the way to meeting each standard. As part of this project, students’ explanation skills will be regularly measured using assessments, observations and interviews, and teacher and student classroom interactions will be regularly observed. Teachers will also be formatively surveyed for their perspectives on the efficacy of the resulting dynamic language progression for assessment and instructional planning. As parents have already signed the UCLA Lab School blanket consent form, they are not required to sign any additional forms at this time. Any questions about this study should be directed to Dr. Kimberly Kelly, the Project Coordinator (978-821-8708 or drkimberlykelly@me.com ), or Dr. Alison Bailey, the Principal Investigator(310-825-1731 or abailey@gseis.ucla.edu).